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Steel and Composite Structures
  Volume 14, Number 2, February 2013 , pages 191-204

Behavior of Hybrid Double Skin Concrete Filled Circular Steel Tube Columns
Jin-Kook Kim, Hyo-Gyoung Kwak and Ji-Hyun Kwak

    A hybrid double skin concrete filled (HDSCF) circular steel tube column is proposed in this study. The yield strength of the outer steel tube is larger than 690MPa and the inner tube has less strength. In order to achieve efficiency with the high strength outer tube, a feasibility study on reducing the thickness of the tube below the specified design codes for CFTs was conducted based on an experimental approach. The experiment also took variables such as thickness of the inner tube, hollow ratio, and strength of concrete into consideration to investigate the behavior of the HDSCF column. In order to estimate the applicability of design equations for CFTs to the HDSCF column, test results from CFT and HDSCF columns with design codes were compared. It was found that the axial compressive performance of the proposed HDSCF column is equivalent to that of the conventional CFT member irrespective of design variables. Furthermore, the design equation for a circular CFT given by EC4 is applicable to estimate the ultimate strength of the HDSCF circular steel tube column.
Key Words
    double skin; 690MPa; hybrid; CFT; confinement
Jin-Kook Kim : Steel Structure Research Division, Research Institute of Industrial Science and Technology,
Yeonsu, Incheon 406-840, Korea
Hyo-Gyoung Kwak and Ji-Hyun Kwak : Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Yuseong, Daejeon 305-701, Korea

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